No engineering degree required. In a few minutes you’ll know exactly which battery fits your ASUS laptop and where to buy it.
The simple 3-step plan
- Open MyASUS and note your exact model name (and check battery health).
- Double-check the battery code quickly—either with Windows’ battery report or by reading the big code on the battery label (like B21N1818 or C41N1906).
- Buy a battery that clearly lists your code from the ASUS collection below.
Tip: Your “battery code” is the key. It’s printed on the battery sticker and often appears in online product titles. Match that code and you’re 95% of the way there.
Step 1 — Use MyASUS (the built-in helper)
Find your exact model name
- Press the Windows key, type MyASUS, and open it.
- On the home screen, write down the full Model Name (for example, “ASUS VivoBook 15 X512DA”). If you see a SKU with extra letters/numbers, note that too.
Check battery health in MyASUS
- In MyASUS, go to Customer Support → Diagnostics (or System Diagnosis).
- Run the Battery test to see Health status (Good/Fair/Poor) and the numbers for capacity.
Step 2 — Double-check your battery code (two quick options)
Option A — Windows Battery Report (no tools needed)
- Right-click Start → Command Prompt (Admin) or Windows Terminal (Admin).
- Paste this and press Enter:
powercfg /batteryreport /output "%USERPROFILE%\Desktop\battery-report.html" - Open the report on your Desktop and look for Installed batteries → NAME. Many ASUS laptops show a battery name that helps you search.
Option B — Read the label (quick photo works)
- Shut down the laptop and unplug the charger.
- Remove the bottom cover (small Phillips screwdriver; use a plastic opening tool to avoid scratches).
- Take a clear photo of the battery sticker. You’re looking for a big code like B21N1818 or C41N1906 (this is the magic search key).
While you’re there, notice how the cable is oriented and where the screw holes are—this helps you visually confirm any online listing.
Step 3 — Buy with confidence
Now that you have your battery code, use it to pick the exact match. The link below takes you to a curated ASUS collection. Product titles and photos make it easy to confirm you’re grabbing the right one.
Shop: Batteries for ASUS – Buy-a-Charger.co.uk
Quick buying checklist
- Your code (e.g., B21N1818, C41N1906, C41N2303, C41N2109) appears in the title or compatibility list.
- Watt-hours (Wh) are similar or clearly a supported upgrade (higher Wh = longer runtime, if it fits).
- Connector and screw holes in the photos look like your battery’s layout.
- Return policy and warranty are clear and reasonable.
Popular ASUS batteries people buy
ASUS B21N1818 — 32Wh
Popular in slim, everyday laptops. Match the code and check the cable exit angle.
ASUS C41N1906 — 90Wh
High-capacity option for performance models. Make sure your laptop bay has room for this 4-cell pack.
ASUS C41N2303 — 90Wh
Newer 90Wh family for late-gen ASUS machines. Compare the connector direction to your original.
ASUS C41N2109 — 90Wh
Common in gaming/creator laptops. Double-check screw-post positions against the product photos.
Don’t see your code here? Use the main ASUS category link above and search by your exact code—there are many more models available.
How to install safely (5-minute overview)
Before you start
- Shut down the laptop and unplug the charger.
- Hold the power button for 15 seconds to remove leftover power.
- Use a small Phillips screwdriver and a plastic opening tool.
- Keep screws in order—lengths can differ by hole.
Swap the battery
- Lift the bottom cover gently (clips live along the edges).
- Unplug the battery cable by pulling it straight out—don’t twist it.
- Remove the old battery screws and lift the battery out evenly.
- Seat the new battery flat, route the cable the same way, and tighten the screws snugly (not too tight).
- Reconnect the cable and close the cover.
First-charge routine (helps the battery meter learn)
- Charge to 100% and leave it on the charger for 30–60 minutes.
- Use the laptop on battery down to about 10–15% (don’t go to 0%).
- Charge back to 100% again. You’re done.
FAQ (short, practical answers)
Do I have to match the battery code exactly?
Yes. That code (for example, B21N1818) is your best guarantee the new battery will fit and work properly.
Can I choose a higher-Wh battery for longer life?
Sometimes. If a higher-Wh version exists for your exact battery family and it physically fits your laptop, you’ll get longer runtime. Always confirm with the product photos.
MyASUS says the battery health is “Poor.” Replace now?
If your runtime is short or the battery swells, replace it. If the laptop still lasts long enough for your day, you can wait—but plan ahead.
The connector looks similar but mirrored in the pictures. Is that ok?
No—connectors are “keyed” and must match the direction in your laptop. Pick the listing that matches exactly.
After installing, Windows says “plugged in, not charging.”
Check if you turned on a charge limit in MyASUS (some modes stop at 60–80%). Otherwise, re-seat the cable or try a full shutdown and 15-second power-button press before turning it on again.
Ready to order?
Grab your battery code and compare it to the listings here: